✨🍏 Volume button trigger to take picture or record/stop video

[istornz]

Description

This PR add the ability to take a picture or start/stop video recording using physical button. Currently both volume button are supported (volume +/-).

Need to be done

• [ ] Android integration.
• [ ] Be able to select the button wanted to trigger action (next release).

Checklist

Before creating any Pull Request, confirm that it meets all requirements listed below by checking the relevant checkboxes ([x]).

• [ ] 📕 I read the Contributing page.
• [ ] 🤝 I match the actual coding style.
• [ ] ✅ I ran flutter analyze without any issues.

Breaking Change

• [ ] 🛠 My feature contain breaking change.

If your feature break something, please detail it